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COMMITMENTS AND CONTINGENCIES - Lease Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Operating lease liabilities, current (Accrued liabilities) | $ 4,261 | $ 4,542
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities, Current | Accrued Liabilities, Current
Operating lease liabilities, noncurrent (Other liabilities) | $ 12,492 | $ 15,209
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent
Total operating lease liabilities | $ 16,753 | $ 19,751
Weighted average remaining lease term | 6 years | 6 years 4 months 24 days
Weighted average discount rate | 7.50% | 7.70%

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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